MPT - Multi-Phase Technologies

HARDWARE: NPE-SE and NPE-BH

MPT-DAS-1

Electrical Impedance Tomography System

MPT-EIT2000 Series

Fully Autonomous Resistivity and IP Monitoring System

NPE-SE and NPE-BH

Non-Polarizing Electrodes

Custom ERT Cables

Stainless Steel Wire-wound Electrodes
Solid Metal Electrode Takeouts with Molded Covers

Multi-Phase Technologies has developed a new type of non-polarizing electrode (NPE) for resistivity and induced-polarization (IP) measurements. The electrode uses a new chemical formulation consisting of a tin metal electrode in an electrolyte of a chloride salt and an organic polymer. The physical construction of the electrode is also improved and uses a porous plastic infused with the chloride-polymer electrolyte.

There are two versions:

Surface Electrode (NPE-SE)
Borehole Electrode (NPE-BH).

The SURFACE ELECTRODE (NPE-SE) is approximately 7 inches long and 1 inch in diameter. At the top of the NPE-SE is a 5/16-inch hex-head, stainless-steel bolt that serves as the lead connection. The bottom of the NP-SE is a tough ultra-high molecular weight (UHMW) polyethylene cone tip that allows the NP-SE to be driven into the ground.

The BOREHOLE ELECTRODE (NPE-BH) is approximately 7 inches long and 1-3/8 inches in diameter, allowing it to be used in 2-inch diameter boreholes. The NPE-BH can be adapted to fit various cable sizes.

In both versions of the electrode, the outside cylinder is made of porous polyethylene and has more surface area than standard non-polarizing electrodes which only have a porous ceramic tip. This allows a better connection between the fluid inside the tubing and the media outside the electrode. The electrode uses non-toxic materials, rather than the commonly used toxic formulations (copper/copper sulfate and lead/lead chloride). Because of this, these electrodes are better suited for environmental applications and for use in boreholes.

The specifications are available in Adobe Acrobat Reader™ format.

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